Hermetically Coated Optical Fibers: Hydrogen Permeation And Fatigue Properties

K. S. Kranz; P. J. Lemaire; R. G. Huff; F. V. DiMarcello; K. L. Walker

doi:10.1117/12.960048

26 April 1989 Hermetically Coated Optical Fibers: Hydrogen Permeation And Fatigue Properties

K. S. Kranz, P. J. Lemaire, R. G. Huff, F. V. DiMarcello, K. L. Walker

Proceedings Volume 0992, Fiber Optics Reliability: Benign and Adverse Environments II; (1989) https://doi.org/10.1117/12.960048
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

Abstract

Hydrogen permeation rates have been measured for fibers coated with a CVD applied amorphous carbon hermetic barrier. The H2 permeation was characterized by measuring optical loss increases at elevated temperatures at both high and low hydrogen pressures. Very low predicted values for the rates of hydrogen permeation over a wide range of operating temperatures were found, with an experimentally determined activation energy of 23.7 kcal/mole. In-situ measurements of loss increases upon exposure to hydrogen have shown the existence of a lag time where no hydrogen reaches the core of the fiber. Fiber strengths for the carbon coated hermetic fibers are typically 500-600 ksi. Fatigue properties are markedly improved by the presence of this type of hermetic coating. Dynamic fatigue results show extremely high n values on the order of 350-1000. Static fatigue tests in 21 ° C air and 50% relative humidity give n values of about 200. This is a great improvement over the fatigue results for non-hermetic fibers which exhibit n values of approximately 20.

Citation Download Citation

K. S. Kranz, P. J. Lemaire, R. G. Huff, F. V. DiMarcello, and K. L. Walker "Hermetically Coated Optical Fibers: Hydrogen Permeation And Fatigue Properties", Proc. SPIE 0992, Fiber Optics Reliability: Benign and Adverse Environments II, (26 April 1989); https://doi.org/10.1117/12.960048

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